I. Basic Information

Model: CFP-DI-304 (cFP-DI-304)

Manufacturer: National Instruments (NI)

Series: Compact FieldPoint (cFP)

Part Number: 777318-304

Status: Obsolete (Out of Production)

Location: High-density 32-channel 24VDC digital input, suitable for sensors / buttons / relays

Input Type: Sink (Current Sinking, Low Level Active)

II. Core Specifications (Electrical / Channels)

Number of channels: 32 isolated digital inputs

Input voltage: 18–30 VDC (nominal 24V)

Input impedance: 30 kΩ

Logic levels:

ON (high): ≥ 18 VDC

OFF (low): ≤ 5 VDC

Isolation: 250 Vrms (channel - backplane isolation, no isolation between channels)

Transient withstand voltage: 2300 Vrms / 5 seconds

Update rate: 1 kHz (full channel)

Power consumption: Approximately 1 W (powered by backplane)

Connector: 68-pin VHDCI female connector (requires CFP-CB-1 wiring base)

Indicator lights: 1 green LED per channel; 1 green LED for POWER/READY each

III. Mechanical and Environmental

Dimensions: 127 × 66 × 24 mm (standard cFP module)

Weight: Approximately 193 g (6.81 oz)

Installation: cFP-BP-4 / BP-8 backplane, hot-swappable (HotPnP)

Operating temperature: -40 °C ~ +70 °C (vertical); -40 ~ +65 °C (other orientations)

Storage temperature: -55 °C ~ +85 °C

Humidity: 10%–90% RH, no condensation

Vibration: 5 grms (random) / 5 g (sinusoidal), 10–500 Hz

IV. Wiring and Base

Must be paired with: CFP-CB-1 (36-pin universal wiring base)

Wiring specifications: 16–26 AWG copper wire, stripped 6 mm, torque 0.5–0.6 N·m

Power supply: External 24VDC distributed to the module and sensors via CB-1

V. Compatibility

Backplane: cFP-BP-4 (4 slots), cFP-BP-8 (8 slots)

Controller: cFP-180x / 2000 / 2100 series

Software: LabVIEW, FieldPoint Explorer, Modbus RTU/TCP

VI. Discontinued Replacement (Direct Replacement)

Recommended replacement: NI-9425 (C series, 32-channel 24V Sink input, 7 μs high speed, isolation, direct replacement)

Base replacement: NI-9923 (C series universal terminal base)

VII. Typical Applications

32-channel pushbutton / switch / proximity switch input

PLC expansion high-density DI

Production line status monitoring (sensors / relay feedback)

Industrial control cabinet I/O centralized collection